Display Settings:

Format

Send to:

Choose Destination
See comment in PubMed Commons below
Neurobiol Aging. 2012 Dec;33(12):2950.e5-7. doi: 10.1016/j.neurobiolaging.2012.07.005. Epub 2012 Jul 26.

Length of normal alleles of C9ORF72 GGGGCC repeat do not influence disease phenotype.

Author information

  • 1Department of Neuroscience, Mayo Clinic, Jacksonville, FL 32224, USA.

Abstract

Expansions of the noncoding GGGGCC hexanucleotide repeat in the Chromosome 9 open reading frame 72 (C9ORF72) gene cause frontotemporal dementia (FTD) and amyotrophic lateral sclerosis (ALS). In this study we aimed to determine whether the length of the normal-unexpanded-allele of the GGGGCC repeat in C9ORF72 plays a role in the presentation of disease or affects age at onset in C9ORF72 mutation carriers. We also studied whether the GGGGCC repeat length confers risk or affects age at onset in FTD and ALS patients without C9ORF72 repeat expansions. C9ORF72 genotyping was performed in 580 FTD, 995 ALS, and 160 FTD-ALS patients, and 1444 controls, leading to the identification of 211 patients with pathogenic C9ORF72 repeat expansions. No meaningful association between the repeat length of the normal alleles of the GGGGCC repeat in C9ORF72 and disease phenotype or age at onset was observed in C9ORF72 mutation carriers or nonmutation carriers.

Copyright © 2012 Elsevier Inc. All rights reserved.

PMID:
22840558
[PubMed - indexed for MEDLINE]
PMCID:
PMC3617405
Free PMC Article
PubMed Commons home

PubMed Commons

0 comments
How to join PubMed Commons

    Supplemental Content

    Full text links

    Icon for Elsevier Science Icon for PubMed Central
    Loading ...
    Write to the Help Desk